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Goodwill and Other Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Goodwill by reporting unit and segment    
Goodwill $ 135,411 $ 137,820
Marketing and Events Group [Member]
   
Goodwill by reporting unit and segment    
Goodwill 84,524 85,740
Marketing and Events Group [Member] | Marketing & Events U.S [Member]
   
Goodwill by reporting unit and segment    
Goodwill 62,686 62,686
Marketing & Events International [Member]
   
Goodwill by reporting unit and segment    
Goodwill 21,838 23,054
Marketing & Events International [Member] | GES United Kingdom [Member]
   
Goodwill by reporting unit and segment    
Goodwill 12,890 13,894
Marketing & Events International [Member] | GES Canada [Member]
   
Goodwill by reporting unit and segment    
Goodwill 8,948 9,160
Travel & Recreation Group [Member]
   
Goodwill by reporting unit and segment    
Goodwill 50,887 52,080
Travel & Recreation Group [Member] | Brewster [Member]
   
Goodwill by reporting unit and segment    
Goodwill 43,242 44,435
Travel & Recreation Group [Member] | Glacier Park [Member]
   
Goodwill by reporting unit and segment    
Goodwill 4,461 4,461
Travel & Recreation Group [Member] | Alaska Denali Travel [Member]
   
Goodwill by reporting unit and segment    
Goodwill $ 3,184 $ 3,184